SMS:CMS-Flow Spatial Datasets

Spatially varied data, or spatial datasets are integral to the use and application of the CMS-Flow numerical engine. The engine uses spatial data for input and each process simulated by the engine creates spatial data sets that can then be visualized and used for post processing in the SMS.

Input Datasets

CMS-Flow has several spatially variable input fields. The inputs are sorted by process and labeled with units below.

Hydrodynamics

Variable	Units	Symbol	Description
Bottom Friction	NA	(none)	Roughness of the bottom used to simulate resistance to flow. For example, this could be based on a Manning $n$ value.

Sediment transport/Morphology change

Variable	Units	Symbol	Description
D50	milimeters	($mm$)	Median grain size for particles in each cell of the grid domain
Hard Bottom	meters	($m$)	Constraint for maximum erosion for each cell of the grid domain

Salinity

Variable	Units	Symbol	Description
Initial Concentration	parts per thousand	($ppt$)	Initial salinity concentration for each cell of the grid domain

Output Datasets

Hydrodynamics

Variable	Units	Symbol	Description
Water Surface Elevation	meters	($m$)	Elevation above mean sea-level computed at the centroid of each cell.
Current Velocity	meters per second	($m/sec$)	Velocity components in the $u$ and $v$ directions computed at the top and right side of each cell. The SMS interface interpolates these values over the cell, converts them to global world ($x,y$) values and displays these as vectors.
Flow Rate	cubic meters per second	($m^{3}/sec$)	Flux over each cell.

Sediment transport

Variable	Units	Symbol	Description
Concentration Capacity	kilogram per meter cubed	($kg/m^{3}$)	Total transport capacity for flow in the cell. Computed for LUND-CIRP, van Rijn, and Watanabe transport equations.
Sediment Concentration	kilogram per meter cubed	($kg/m^{3}$)	Computed suspended sediment concentration at the centroid of each cell
Sediment Transport Rate	cubic meters per second per meter	($m^{3}/sec/m$)	Computed transport rate across the right and top faces of each cell. Displayed as a vector quantity in SMS

Morphology change

Variable	Units	Symbol	Description
Bed depth	meters	($m$)	Depth below mean sea level to current floor of the model (positive values measured downwards)
Change in depth	meters	($m/sec$)	Change in the depth at each cell since the start of the simulation

Salinity

Variable	Units	Symbol	Description
Salinity Concentration	parts per thousand	($ppt$)	Concentration at each cell centroid

Related Topics

• CMS-Flow